Machine for dressing millstones



J. L. MARONEY.

(No Model.)

2 Sheets-Sheet 1.

MAGHINE FOR DRESSING MILLSTONES.

Patented Jan. 2 9, 1889.

WITNESSES l;, I -|Il I4 llllllllllllli M" (No Model.)

2 Sheets-Sheet 2.

J. L. MABONEY.

MACHINE FOR DRESSING MILLSTONES.

Patented Jan. 29, 1889.

WITNESSES ttorney I I!v PETERS, Phnlmlilhagnphcr. Washinghm l7v C.

UNITED. STATES PATENT ()FFICE.

JAMES L. MARONEY, OF ALBERTVILLE, ALABAMA.

MACHINE FOR DRESSING MILLSTONES.

SPECIFICATION forming part of Letters Patent No. 397,014, dated January 29, 1889.

Application filed August 16,1888. Serial No. 282,848. (No model.)

To all whom it may concern:

Be it known that I, JAMES L. MARONEY, a citizen of the United States of America, residing at Albertville, in the county of Marshall and State of Alabama, have invented certain new and useful Improvements in Machines for Dressing Millstones; and I do hereby declare the following to be a full clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, an d to letters or figures of reference marked thereon, which form a part of this specification.

- This invention relates to machines for dressing millstones.

The object of the invention is to connect the pick-operating shaft by gearing with a pair of pinions arranged to engage racks carried by an adjustable frame, whereby the series of picks maybe caused to advance slowly over the surface of a stone while at work, and may be rapidly shifted to the starting-point after such advance.

Vith this and minor objects in view the invention consists in novel features and combinations, .to be hereinafter described and claimed.

In the accompanying drawings, Figure l is a perspective view of a stone-dressing machine embodying my improvements. Fig. 2 is a plan view, the top of the housing being removed. Fig. 3 is a vertical section taken on line 00 .r of Fig. 2. Fig. 4. is a perspective view of one of the picks detached.

The operating mechanism is movably support-ed on a stout frame consisting of cornerposts A and longitudinal and transverse top beams, A A Floor-sills are also provided, preferably, upon which the posts A rest. This frame is provided with horizontal ways (1, arranged a little below the longitudinal beams A and supported at their ends by the posts A, upon which ways are mounted grooved rolls B, the journals 1) of which are mounted in bearings c, secured to or forming part of the side walls of the housing C, which incloses the operating shafts and gears. \Vithin this housing, at one end, are arranged a number of pick-blocks, I), provided at their lower ends (which extend below the bottom of the hous ing) with steel picks a of suitable size and shape. These blocks D are provided near their lower ends, but within the housing, with stop-pins cl, which by coming in contact with the bottom or floor c arrest the downward movement of the blocks and picks, and have near their upper ends transverse slots (1 the upper ends of which terminate abreast the horizontal axis of the drive-shaft E. This shaft is mounted in hearings in the housing, and is provided at one end with a hand crank or pulley, by which power can be transmitted. The main part of the shaft between its bearings is provided with a drum or cylinder, 6, carrying on its periphery a number of pins,

slots (1* of the pick-blocks D, a pinion, e, being also secured to the shaft to actuate the train of gears connecting this pinion with pinions f, secured to the outwardly-proj ectin g ends of the last shaft, F, of the train.

To the corner-posts A, at one end of the frame, are pivoted the ends of a yoke, G, the longitudinal rails of which are provided on their under sides with racks C, adapted to engage with the pinions f, before mentioned, when the yoke is adjusted to its horizontal position, as shown in Fig. 1, but to be freed therefrom to permit the free moving of the housing forward and back by raising the free end g of the yoke.

The end of the frame opposite that to which the yoke is pivoted is provided with a crossrail, a, to which is pivoted a button, a adapted to be turned to rest with one end on the end rail of the yoke to hold the racks thereof in mesh with the pinions f or to be turned horizontally to permit the free end of the yoke to be raised to disengage the racks g from the pinions f.

In operation a stone to be dressed is properly positioned beneath the housing, the latter having been moved up to the front end of the frame, as shown in Fig. 1. The shaft E now being turned, the pins e of cylinder e will pick up and drop the respective pickblocks D, thus causing the picks d to operate on the face of the stone. The rotation of shaft E meanwhile actuates the train of gears, and the pinions f, el'igaging the racks g, cause the entire housing and its contained mechanism to travel above the face of the stone, thus causing the picks d to operate on all parts of 6, arranged in line with and to engage the the upper face from end to end.

The housing" having reached the limit of its travel, the button a on cross-rail a is turned horizontally or parallel with said rail, and the free end of the yoke (3 is raised to lift the racks free from the pinionsf, when the housing ean be moved forward by hand to any position desired.

It will be understelnl, of course, that the picks used are renmvahle and may have any desired profile, and that the uck-blocks D may be Weighted to any desired extent.

I claim 1. In a stone-dressing machine, the eonibination of the frame having parz'illel ways, the yoke pivoted to the frame and provided with racks, the housing provided with rollers mounted to travel on the ways of the frame, the vertical pick-blocks, armed cylinder, and geantrain arranged within the housing, and the Dinionsf, keyed to the projecting ends of one of the shafts of the gear-train, suhstz'in- 3 tially as d eseri bed.

2. In a stone-dressing; machine, the combination, substantially as described, of the frame provided with parallel Ways, the housing having rollers mounted to traverse said Ways, a

series of pick-blocks mounted to slide vertically in the housing, a drive-shaft provided with an armed cylinder adapted to actuate the nch-blocks, a gear-train connected with the drive-shaft and having the ends of one shaft projecting beyond the walls of the housing", pinions f, keyed to said shaft, the yoke pivoted at one end of the frame and provided with downwardly-facing' rack-bars arranged to engage the pinions f or be lifted free therefrom, and means to hold the yoke parallel with the Ways of the frame.

In testimony whereof Iailixniysignature in presence of. two witnesses.

JAM ES II). M Alfl )N ICY.

\Yiljnesses:

.Lis. L. lURKE, .T. C. CHANDLER. 

